Make sure hackcambridge.com has good Google Lighthouse and PageSpeed insights

[vanjo9800]

We need to make sure our homepage has good metrics reported by Google Lighthouse and PageSpeed tools.
This will guarantee fast load of items and reduce the use of bad practices inside.

You can learn how to do the Lighthouse and PageSpeed assessments here:

• https://developers.google.com/web/tools/lighthouse#devtools
• https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fhackcambridge.com

[vanjo9800]

Images quality and format has been hugely compressed - few minor issues remain!